energy stocks led the downturn both for the day and the week. and as you can see, materials and industrials were also weak. toyota got the okay from a u.s. judge on that massive class action settlement. the lawsuit was brought by car owners who lost value on their cars because of sudden unintended acceleration problems. toyota shares fell 0.5% to just above $92 per share. apple says it will withdraw patent claims against a new samsung phone after the company said it will not sell the phone in the u.s. but apple shares still sold off, down more than $5 to $509. barnes and noble says british media company pearson is making a $90 million investment in its nook media unit. that's about a 5% stake. back in april, microsoft made a $300 million investment in the unit. looking at the players: shares of barnes and noble jumped more than 4% to almost $15 a share. pearson slipped a fraction. and microsoft lost 1.5%. wal-mart plans to start monitoring the warehouses of subcontractors it uses here in the u.s. the program stems from complaints of poor worker